Improvement in the manufacture of lamps



2 Sheets-Sheet J. & T. B. ATTERBURY.

MANUFAGTURE 0F LAMPS. No. 109,370. Patented Nov. 22,1870. P!ai] ma Fay]2 Sheets--Sheet 2.

J. s. 8@ T. B. ATTERBURY. MANUFACTURE 0F LAMPS.

No. 109,370. Patented Nov. 22.17870.

"dialisi iiiie @sind fottilo.

JAMES SgATTE'llURY AND THOMAS l. ATTERBURY, PITTSBURG,

PENNSYLVANIA: l

Letters Batent No. 109,370fdated November 22, 1870.

lMPROlLMENTIN THE MANUFACTURE 0F`LAMPS.

The Schedule referred to in these Letters Patent and erasing part or thesame.

` To all whom it 'may concern:

Be it known that we, Janus S. A'r'rrrnnonv and .jinonrts B. ATU-renner,of Pittsburg, in thecourrty of YAllegheny nud State of' Pennsylvania,have invented a new and'usel'ul Improvement in the 'Manufacture ofLamps; and we do hereby declare that the following is afull, clear, and,exact description thereof, reference being had to lthe accompanyingdrawing making part ot' this specification, in which- Figure 1, plate 1,is a section, taken vertically through a mold which is adapted for usein producing the lamps. f

v Figure 2, plate 1, is a similar view, showing a lnurp finished andready to be removed from thelrnold. Figure 3, plate 2, is a top view ofthe mold. p Figure 4,1)late'2,is atop view of the screw-threanled socketand toothed segment supported nporr the hasev of the mold.Sirnilarletters of rel'or'cnee indicate oorrespor'rding parts in thesever-al ligures.

The ohject'of, this invention is to produce screwthreads on the pegsotlamp-bowlsv and other. articles ot glass or vitreous ware, wit-houtleaving the joiutrnarlrs of the molds on the pegs.

rlhe nature ot our invention consists ina bottom section of mold,constructed and operated as hereinafter described, for making seamlessscrew-threade( pegs on the bot-torn of glass-ware.

To enable others skilled in the art to understand our invention, we willexplain its eonstructipn and operation.

llhe mold in which the hody'orbowl o of the lamp is formed 4rnay be madein the usual wcll-ltnown man# ner; thatis to say, it may be cour posedof an upper centrally-divided hinged portion, A, and a lower portion, B,which' latter has an annular dovetail tenen, g, around the margin of itscavity, ior receiving around it a correspoding groove formed into thebottoni of the upper or divided section, and thus holding the two partsrmly together'. Through the center ol' the mold-section B a circularopeniug'is nraile for receiving a cylindrical portion b', into tlieupper' end of :which a screw-threaded socket is formed.

W hen this screw-socket portion b' is raised to the position indicatedin iig. 1, :.gainst a shoulder formed around the ripper cud ol' lllreopening through the mold-section B, the rnold is ready to have formed init a lamp-howl with a screw-threaded pcg, b.

'lhe mold-section is supported upon and elevated above a base section,(l, into or through the center ot` which a screw-socket, ci, is formed,adapted to reeeive into it a male screw, c', which is formed en tlrestem c ot' the screw-socket portion b', as shown in The segment S turnsabout a fixed stem, e, and is provided with a stop-pin, m, rising fromthe base portion C, which pin will stop the segment when thescrew-socket piece br is raised to its highest point, indicated in fig.),and'also stop the further descent-of tlfe said socket piero when it isfreed from a peg, as indicated in fig. 2.

The operation is as follows:

The workman gat-hers a suitable 'qrrarrtity of hot glass on the end othis punty, and places `this glass into t'r'recenter oi' the section iiand screw-socket if' to forni the Screw-peg ii.

rllrev workman their gathers another piece of het glass on thcopnnty toform the body of tirefount or vhowl u., and this, boing pnt into themold, unites with the glass which t'oirns the pee.

'j he top portion of the mold is their adjusted in place, as shown infig.' 1, and the bowl a. is formed by blowing in the usual manner.

lHaving completed-the article in the nronl, the segrrrent S is movedaround and the screw-socket portion b' depressed by unscrewing it fromthe peg b,

thus forming a peg without a joint-marit. v

l It will be seen, by reference to figs. l. and 2,that the screw-pcgb-is formed in ccneavity of the larilpi howl, and does not extend belowthe lowest port-ion of this bowl.

' This feature is described and clairned under an application forLetters .Patent tiled July 25, 1870, and is therefore not clairned underthis petition.

We do not eonne our invention to lamp-bowl of' founts of the form shownin the drawing, as it is obvious that the invention is applicable to allforms of lamp-bowls, fonnts, or reservoirs having screwpegs on thenr, aswell as other' articles having screwpegs.

Neither do we linrit our invention to making male screw-tln'eads'onglass or vitreous hollow articles, as

it rnay veryrendily he modified, by substituting a stern, b, with a maleinstead ot'n. female moldingserew, and thus be used for making femalethreads on portions of such articles.

Neither do we limit ourselvesto theVvibrat-ing see-- tor arrtl'pirrionfor revolving the stern c as a crank, for other well-known gearing ruayhe substituted therefor withontdeparting from our invention.

'hzlt we elairn as oru'inveul-i0n, and desire to sccure by LettersPatent, -is- The lower' nrold 1 1', operated by the stern c, inale andfemale screws cdc?, and an apparatus which re.-

volvcs this stem, in combination with. the rnoldwvlrich v makes thebottom of a vessel, for making seamless screw-threaded pegs on thebottoms of glass or other vitreous ware.

JAMES S. ATTERBURY.

THOMAS B. ATTERBUR'Y. Witnesses:

